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Experimental Study on the Effect of ASP Flooding on Improving Oil Recovery in Low Permeability Reservoirs Based on a Partial Quality Tool

by Bin Huang 1,2,*, Xinyu Hu 1, Cheng Fu 1,2,* and Quan Zhou 3
1
Key Laboratory of Enhanced Oil Recovery (Northeast Petroleum University), Ministry of Education; College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
2
Post-Doctoral Scientific Research Station, Daqing Oilfield Company, Daqing 163413, China
3
Daqing oilfield oil production engineering research institute, Daqing 163712, China
*
Authors to whom correspondence should be addressed.
Processes 2020, 8(3), 296; https://doi.org/10.3390/pr8030296
Received: 3 February 2020 / Revised: 2 March 2020 / Accepted: 3 March 2020 / Published: 5 March 2020
In order to solve the problem of the poor oil displacement effect of high molecular weight alkali/surfactant/polymer (ASP) solution in low permeability reservoirs, Daqing Oilfield uses a partial quality tool to improve the oil displacement effect in low permeability reservoirs. In the formation, the partial quality tool degrades the polymer through active shearing action, reducing the molecular weight of the polymer, to improve the matching degree to the low permeability oil layer and the oil recovery. In order to study the ability of the partial quality tool to improve the oil displacement effect, the matching degree of high molecular weight ASP solution to low permeability cores is studied, and the ability of quality control tools to change the molecular weight is studied. Then, experimental research on the pressure and oil displacement effect of high molecular weight ASP solution before and after the actions of the partial quality tool is carried out. The results show that ASP solutions with molecular weights of 1900 × 104 and 2500 × 104 have a poor oil displacement effect in low permeability reservoirs. After the action of the partial quality tool, the injection pressure is reduced by 5.22 MPa, and the oil recovery is increased by 7.79%. The injection pressure of the ASP solution after shearing by the partial quality tool is lower than that of the ASP solution with the same molecular weight and concentration without shearing, but the oil recovery is lower. On the whole, the use of the partial quality tool can obviously improve the oil displacement effect in low permeability reservoirs. View Full-Text
Keywords: ASP flooding; low permeability oil layer; partial quality tool; maximum injection pressure; oil recovery ASP flooding; low permeability oil layer; partial quality tool; maximum injection pressure; oil recovery
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Huang, B.; Hu, X.; Fu, C.; Zhou, Q. Experimental Study on the Effect of ASP Flooding on Improving Oil Recovery in Low Permeability Reservoirs Based on a Partial Quality Tool. Processes 2020, 8, 296.

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